---
product_id: 314573022
title: "Bayer K9 Advantix II Flea, Tick and Mosquito Prevention for X-Large Dogs, Over 55 lbs Over 55 lb 5420429"
brand: "k9 advantix"
price: "₨75589"
currency: LKR
in_stock: true
reviews_count: 5
category: "K9 Advantix"
url: https://www.desertcart.lk/products/314573022-bayer-k9-advantix-ii-flea-tick-and-mosquito-prevention-x
store_origin: LK
region: Sri Lanka
---

# 30-day continuous protection Water-resistant topical formula Kills 98-100% fleas in 12h Bayer K9 Advantix II Flea, Tick and Mosquito Prevention for X-Large Dogs, Over 55 lbs Over 55 lb 5420429

**Brand:** k9 advantix
**Price:** ₨75589
**Availability:** ✅ In Stock

## Summary

> 🐾 Shield your XL dog from pests—because only the best will do!

## Quick Answers

- **What is this?** Bayer K9 Advantix II Flea, Tick and Mosquito Prevention for X-Large Dogs, Over 55 lbs Over 55 lb 5420429 by k9 advantix
- **How much does it cost?** ₨75589 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.lk](https://www.desertcart.lk/products/314573022-bayer-k9-advantix-ii-flea-tick-and-mosquito-prevention-x)

## Best For

- k9 advantix enthusiasts

## Why This Product

- Trusted k9 advantix brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Month-Long Defense:** One application protects your dog for a full 30 days—no daily hassle.
- • **Rapid Flea Elimination:** Starts killing fleas within 12 hours—because your dog deserves fast relief.
- • **Triple Threat Protection:** Repels and kills fleas, ticks, and mosquitoes—ultimate outdoor armor.
- • **Vet-Recommended Reliability:** Trusted by veterinarians for safe, effective parasite control.
- • **Easy Application, Lasting Power:** Topical, water-resistant formula stays effective through baths and rain.

## Overview

Bayer K9 Advantix II offers six monthly topical treatments designed for extra-large dogs over 55 lbs, delivering rapid and lasting protection by killing fleas within 12 hours and repelling/killing ticks and mosquitoes. This water-resistant, vet-recommended formula ensures your dog stays protected against dangerous parasites and vector-borne diseases for a full month per dose.

## Description

New Advantix Blue kills 98-100% of fleas on dogs within 12 hours and continues protection at least 4 weeks. Repels and kills a majority of ticks and mosquitoes. This is the ultimate protection for your dog! Each packet contains 6 applications providing 6 months of protection. Effective Flea & Tick Control . . . No Prescription Required!Guaranteed US EPA approved. Each package of K9 Advantix for Dogs lasts 4 to 6 months (One vial per month) Kills 98%-100% of fleas within 12 hours - helpful in dogs with Flea Allergy Dermatitis Protects against deadly Lyme Disease, spread by ticks Repels and kills mosquitos, carriers of dangerous West Nile Virus Water-resistant, easy to apply formula stays on in baths or in the rain

Review: I brought my dog to West Virginia, and thank God for Advantix II — because I’ve been finding half-dead ticks every single day (no joke) in places where she sleeps or rests. At first, I was confused. I thought "repels ticks" meant it would work like bug spray does for mosquitoes, keeping them away completely. But after looking into the active ingredient, permethrin, I realized that in this case, “repel” means: once a tick touches the treated fur, it becomes so irritated or neurologically impaired that it can’t bite, can’t hang on, and eventually just falls off and dies. That’s still so much better than PetArmor, Frontline, or any of the oral preventatives (like Simparica or NexGard), which require the tick to bite the dog before it dies. No thanks. Every tick I’ve found so far had already dropped off my dog before it had a chance to bite her and feed — exactly what you want in a tick-heavy area. I’ve also tried Wondercide (cedar oil). It works okay for fleas, but it’s just not effective for ticks, especially not in the long term. Its protection wears off after 2–4 hours. I learned the hard way — my dog caught Lyme disease, developed joint pain and a limp. Thankfully, doxycycline helped and she’s okay now, but it required a full 28-day antibiotic course. I would never use oral flea/tick medications. Just ask around — you’ll hear plenty of stories about dogs having seizures after taking them. For me, that risk isn’t worth it. If you have a cat at home, unfortunately Advantix II may not be right for your household — permethrin is toxic to cats (especially when wet). But if you don’t have cats, I highly recommend this product to all dog owners. Tick-borne diseases are no joke. Fleas are annoying — I’ve had to go through the nightmare of clearing an infestation — but at least they just suck blood without causing life-threatening illness. Ticks, on the other hand, can transmit Lyme, Ehrlichia, Rocky Mountain spotted fever, and more. So if you live somewhere warm, humid, grassy, or deer-heavy — do your dog a favor and get Advantix II. It’s been a lifesaver for us.
Review: I have been using this on my dog for the last nine years. It works great. No fleas or ticks. We spend a lot of time hiking in California and Florida. She does not get any ticks. I tried other brands and she would still get some ticks on our hikes. We do off leash hikes wherever we can so she runs thru the brush a lot. I think that most brands take care of the fleas, but this one works really good on ticks. It’s great for people that spend a lot of time with their dogs outdoors.

## Features

- New packaging, same formula: Contains six one month applications of Bayer K9 Advantix II topical flea, tick and mosquito prevention for extra large dogs over 55 pounds
- K9 Advantix II kills through contact, so fleas, ticks and mosquitoes don't have to bite your dog to die
- Veterinarian recommended
- Repels and kills fleas, ticks and mosquitoes
- Topical treatment is easy to apply, starts working to kill fleas within 12 hours and keeps working for 30 days

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B004QRJJ0K |
| Allergen Information | Crab |
| Batteries Included | No |
| Best Sellers Rank | #43,981 in Pet Supplies ( See Top 100 in Pet Supplies ) #51 in Dog Flea Drops |
| Color | Blue |
| Customer Reviews | 4.6 4.6 out of 5 stars (16,215) |
| Date First Available | 7 August 2012 |
| Flavor | Other |
| Item Form | Topical |
| Item Weight | 45.4 g |
| Item model number | 81520429 |
| Number of Items | 6 |
| Pet Life Stage | Senior |
| Pet Type | Dog |
| Product Dimensions | 19.69 x 2.54 x 10.8 cm; 45.36 g |
| Quantity | 1 |
| Size | 6 Pack |
| Volume | 24 Milliliters |
| batteries required | No |

## Product Details

- **Active Ingredients:** Imidacloprid, Permethrin, Pyriproxyfen
- **Brand:** K9 Advantix
- **Item form:** Topical
- **Item weight:** 45 g
- **Scent:** water

## Images

![Bayer K9 Advantix II Flea, Tick and Mosquito Prevention for X-Large Dogs, Over 55 lbs Over 55 lb 5420429 - Image 1](https://m.media-amazon.com/images/I/71-Ak1Anf+L.jpg)

## Questions & Answers

**Q: Has anyone switched over from Frontline Plus to K9 Advantix II and is happy? For Dogs**
A: YES!!!!  I've had the same experience with my dogs as Nicole A replied.  I had been pleased with Frontline for years....but in 2012 (and ever since) it has just stopped working.  One of my dogs is a fur-making machine: and fleas don't seem to bother him...even if I am finding them on him.  The other dog has horrible flea allergies:  has immediate, sustained, and severe "hot spots" after even just ONE flea bite...skin will turn pink all over his body...and he "blows" large amounts of his beautiful, lush, scruffy coat...and he just doesn't seem to be his usual happy, bright, and enthusiastic self :-(   Using Advantix II....he seems to not have problems at all (it keeps the fleas from breeding...although if one occasional transient flea bites him....it will die...but the dog will still get a "hotspot", but nowhere as intense or sustained as without Advantix II...and if I find it quickly and clean it with vinegar, he may not even need a dose of benedryl).  During the "flea season" since using Advantix II he has been able to keep his lush coat with no problems.....to such an extent that I brought him in to my vet's office just to show the vet how well he was doing one summer (the dog had been so bad the previous summer while using Frontline that I had to take him to the vet for skin reactions, fur loss in large areas of his coat, and a secondary infection from scratching...I had been so discouraged about the flea problems that year while on Frontline that I had been taking the dog daily to the lake so he could swim and drown the damned fleas).  The vet was very pleased with the dog's condition with Advantix II, and had stated he has learned from his patients that they are also seeing less effectiveness with Frontline in recent years.  I won't use anything else but Advantix II during this up-coming flea season.  (although I do also spray his coat/skin with vinegar (mixed 1/2 with water) each day as a flea deterrent...especially if he gets a hotspot...and I add a small amount of vinegar to his food as well........and when he does need a bath:  I use EXTREMELY diluted Dr. Bronner's castile liquid soap in the "EUCALYPTUS" version....the dog tolerates it well...and it seems the scent repels fleas a bit.   I use the soap as well to launder the cover of his dog bed at least weekly).   I know that insects can get resistent to certain pesticides over time....and I suspect that is why Frontline no longer works in our area.....I sure hope it doesn't eventually happen with Advantix II as well....and I hope that producers of flea/tick products for dogs will monitor this situation and re-formulate their products as needed to address the situation--regionally if need be.

**Q: I thought I was ordering Advantage II but by mistake, ordered Advantix II.  What is the difference, and does it work the same?**
A: You can’t use advantix on cats.  sadly because advantix 2 is superior and is the best out there because unlike advantage (and unlike frontline) it repels flies and mosquitoes as well as ticks and fleas.  but it is toxic to cats.  as cats should be indoors only you shouldn’t need tick/mosquito repellent just flea.  DO NOT USE ADVANTIX ON CATS!  It is toxic to them

**Q: What about cats? I used to use Advantix on my cats with no problems, as suggested by my vet to save money. Has the formula changed?**
A: Look at the active ingredients for both the dog & cat formulas; They are exactly the same. Only difference is the dosage size which you can easily look up on the internet & save yourself a ton of money

**Q: Could I use this along with a flea/tick collar?**
A: As a vet tech we say a flea collar is basically worthless..At most may keep fleas off pets head. If you can buy flea collar at store probably won’t work and even the script only work minimal. Stick to topical like frontline plus, advantage, advantix and oral like Capstar. Flea collars are most always a waste of $. To remove fleas fast simply bathe dog and let dog sit in water…drowning fleas and follow up in few hours with topical if bad infestation. Just a flea or 2 I’d still bathe but topical probably enough. All topicals are water resistant after 24hr

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by Y***N on 4 June 2025*

I brought my dog to West Virginia, and thank God for Advantix II — because I’ve been finding half-dead ticks every single day (no joke) in places where she sleeps or rests. At first, I was confused. I thought "repels ticks" meant it would work like bug spray does for mosquitoes, keeping them away completely. But after looking into the active ingredient, permethrin, I realized that in this case, “repel” means: once a tick touches the treated fur, it becomes so irritated or neurologically impaired that it can’t bite, can’t hang on, and eventually just falls off and dies. That’s still so much better than PetArmor, Frontline, or any of the oral preventatives (like Simparica or NexGard), which require the tick to bite the dog before it dies. No thanks. Every tick I’ve found so far had already dropped off my dog before it had a chance to bite her and feed — exactly what you want in a tick-heavy area. I’ve also tried Wondercide (cedar oil). It works okay for fleas, but it’s just not effective for ticks, especially not in the long term. Its protection wears off after 2–4 hours. I learned the hard way — my dog caught Lyme disease, developed joint pain and a limp. Thankfully, doxycycline helped and she’s okay now, but it required a full 28-day antibiotic course. I would never use oral flea/tick medications. Just ask around — you’ll hear plenty of stories about dogs having seizures after taking them. For me, that risk isn’t worth it. If you have a cat at home, unfortunately Advantix II may not be right for your household — permethrin is toxic to cats (especially when wet). But if you don’t have cats, I highly recommend this product to all dog owners. Tick-borne diseases are no joke. Fleas are annoying — I’ve had to go through the nightmare of clearing an infestation — but at least they just suck blood without causing life-threatening illness. Ticks, on the other hand, can transmit Lyme, Ehrlichia, Rocky Mountain spotted fever, and more. So if you live somewhere warm, humid, grassy, or deer-heavy — do your dog a favor and get Advantix II. It’s been a lifesaver for us.

### ⭐⭐⭐⭐⭐ Review
*by J***. on 21 November 2025*

I have been using this on my dog for the last nine years. It works great. No fleas or ticks. We spend a lot of time hiking in California and Florida. She does not get any ticks. I tried other brands and she would still get some ticks on our hikes. We do off leash hikes wherever we can so she runs thru the brush a lot. I think that most brands take care of the fleas, but this one works really good on ticks. It’s great for people that spend a lot of time with their dogs outdoors.

### ⭐⭐⭐⭐⭐ Review
*by B***Y on 31 December 2025*

Very happy with the product

## Frequently Bought Together

- K9 Advantix II XL Dog Vet-Recommended Flea, Tick & Mosquito Treatment & Prevention | Dogs Over 55 lbs. | 6-Mo Supply
- K9 Advantix II Large Dog Vet-Recommended Flea, Tick & Mosquito Treatment & Prevention | Dogs 21 - 55 lbs. | 6-Mo Supply
- Advantage II Large Cat Vet-Recommended Flea Treatment & Prevention | Cats Over 9 lbs. | 6-Month Supply

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*Product available on Desertcart Sri Lanka*
*Store origin: LK*
*Last updated: 2026-02-06*